大约有 40,000 项符合查询结果（耗时：0.0697秒） [XML]
Sequence contains no elements?
...boxes for the title and content, the ID and date aren't put on the page at all. Could this be the reason for it passing them as null\new?
– Andy Hunt
Aug 24 '09 at 19:43
2
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NSPredicate: filtering objects by day of NSDate property
...the solution will involve an NSPredicate , but I'm not sure how to put it all together.
9 Answers
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How to map and remove nil values in Ruby
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Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiomatic and performant, and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your ...
Postgresql not creating db with “createdb” as superuser, yet not outputting errors [duplicate]
I am working with a fresh postgresql install, with 'postgres' super user. Logged in via:
5 Answers
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Move all files except one
How can I move all files except one? I am looking for something like:
14 Answers
14
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Intellij reformat on file save
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https://github.com/dubreuia/intellij-plugin-save-actions/issues/63
I actually tried to assign reformat to Ctrl+S and it worked fine - saving is done automatically now.
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Stop an input field in a form from being submitted
...nts it from being submitted? Cool, I didn't know that. Does this work on all browsers? Is it part of a standard, or is it an implementation quirk?
– BlairHippo
Jun 9 '10 at 17:12
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How do you fork your own repository on GitHub?
...pstream https://github.com/userName/Repo
git push origin master
git push --all
(see git push)
See the all process described at "Fork your own project on GitHub".
Six years later (2016), you now have the GitHub importer which allows you to import a repo from another source... including GitHub.
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Can I force pip to reinstall the current version?
... a current version of a package seems not to be working and requires reinstallation. But pip install -U won't touch a package that is already up-to-date. I see how to force a reinstallation by first uninstalling (with pip uninstall ) and then installing, but is there a way to simply force an "upd...
What is the difference between re.search and re.match?
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Now, enough talk. Time to see some example code:
# example code:
string_with_newlines = """something
someotherthing"""
import re
print re.match('some', string_with_newlines) # matches
print re.match('someother',
string_with_newlines) # won't match
print re.match('^someother', s...